There were actually four HUGE causes for WW1, treaties and alliances brought many countries into war, the imperialism of some countries scared other countries, and they were "defending" themselves, there was a lot of weapons stocking, and countries were creating gigantic armies, and that threatened other countries, and then we have plain old nationalism.
Answer:
The sickle made it easier and faster to harvest crops
Explanation:
House of representatives and senate because they are the legislature and the legislature make the laws
